Spunstrand® Inc. has been manufacturing underslab HVAC ductwork for over fifty years in both insulated and non-insulated forms. Insulated and non-insulated ductwork is available in, but not limited to, standard sizes 2″ diameter through 144″ diameter.

The standard guide specification we use is centered around the National Bureau of Standards PS 15-69 and/or the new SMACNA Thermoset FRP Duct construction manual.

Our mine and tunnel ventilation ducts maintain a MSHA approval as a Class 1 rated duct system, and have been used in mining and tunneling applications now for 54 years.

Spunstrand® Inc. manufactures both Zero-Leak (ZL) and Balancing Dampers (BA) for the corrosive fume handling industry for a variety of environments and applications.

Spunstrand® Inc. manufactures a wide variety of FRP filament wound media vapor phase scrubbers. The vessels range from passive venting up to 46,000 CFM within a single vessel.

Spunstrand® Inc. has a dedicated facility for manufacturing chemical and water storage tanks, carbon scrubbers and custom FRP products that will serve our primary industrial and municipal customers as well as emerging markets.

Our Services

For over 50 years, Spunstrand® Inc. has furnished miles of underslab HVAC duct, above ground industrial and municipal duct systems and various special applications. Installations are in every state and foreign countries. All these years and miles of duct have produced a multitude of reliable services available to engineers, contractors and architects.